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Treacy played with Bennettsbridge during a golden age for the club. He won his first championship medal in 1959 following a 4-6 to 1-4 defeat of Erin's Own. Treacy won a second consecutive medal in 1960 as Bennettsbridge accounted for Glenmore by 4-5 to 3-4.

Three-in-a-row proved beyond Bennettsbridge, however, the club reached the decider again in 1962. A 5-7 to 2-8 defeat of Lisdowny gave Treacy a third championship medal.

Bennettsbridge surrendered their championship crown again the following year, however, a 4-9 to 1-4 trouncing of Glenmore in 1964 gave Treacy a fourth championship medal.

Mooncoin wrested the title from "the Bridge" in 1965, however, Treacy won his fifth and sixth championship medals following victories over Mooncoin and Thomastown over the following two years.

Treacy made his senior championship debut on 12 July 1959 in a 2-9 to 1-11 provincial final defeat of Dublin. It was his first Leinster medal. Treacy was later dropped from the starting fifteen for Kilkenny's All-Ireland final meeting with Waterford on 6 September 1959. That came ended in a 1-17 to 5-5 draw.[4] Treacy was also an unused substitute for the subsequent replay, which Waterford won by 3-12 to 1-10 win.[5]

After surrendering their provincial crown for the next two years, Treacy won a second Leinster medal in 1963 following a 2-10 to 0-9 defeat of Dublin. This victory allowed Kilkenny to advance directly into an All-Ireland showdown with Waterford on 1 September 1963. "The Cats" entered the game as underdogs, however, star forward Eddie Keher proved to be the difference with a magnificent display in which he scored fourteen points. Despite a hat-trick of goals from Waterford's Séamus Power, Kilkenny secured a 4-17 to 6-8 victory.[6] It was Treacy's first All-Ireland medal while it also proved to be his last championship outing for Kilkenny.